烦帮我把句子改写成含if 虚拟条件句的复合句

题目

烦帮我把句子改写成含if 虚拟条件句的复合句
1、I made a lot of mistake because I am careless
2、She is still very weak.So I won't allow her to go to school
3、We didn't catch the train because we were late.
4、He doesn't have enough money,so he cannot buy a car.
5、Xiaoming doesn't study hard; so he has trouble with his GET4.
把句子改写成含if 虚拟条件句的复合句
对这些语法我一窍不通.

答案

1.If I am not careless, I wouldn't have made a lot of mistake.
2.If she is not weak, I would allow her to go to school.
3.If we were not late, we would have caught the train.
4.If he has enough money, he would buy a car.
5.If Xiaoming studies hard, he wouldn't have trouble with his GET4.(应该是CET4吧?）